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6.4 Electrical Tests (CIS-E)

Two types of electrical tests are described here. First, several fuel injection electronic control functions can be checked and evaluated by measuring differential pressure regulator current under different running conditions. Next, the voltage and continuity tests listed under Control Unit Inputs can be used to help determine whether there are faults in the wiring or components which provide information to the control unit. If all control unit inputs are found to be correct and the system does not perform as specified, the control unit itself may be faulty. The tests described under this heading apply only to CIS-E fuel injection systems. For information about electrical tests of the CIS-E Motronic system, see 6.5 Electrical Tests (CIS-E Motronic).

For purposes of general troubleshooting, the electrical tests below are arranged in a specific order designed to logically isolate the cause of a problem. For best results, the tests should be carried out in the order in which they appear. All tests of differential pressure regulator current require connecting an ammeter in series with the differential pressure regulator as described in Differential Pressure Regulator under 6.1 Air Flow Measurement and Fuel Metering.

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